Offset printing-press



Sept. 6, 1932. H. HEN SE OFFSET PRINTING -PRESS Filed Sept. 15,- 1930 2 Sheets-Sheet 1 Sept. 6, 1932.

H. HENSE OFFSET PRINTING PRESS Fild Sept. 15, 1930 2 Sheets-Sheet 2 Patented Sept. 6, 1932 UNITED TATES;

innmnrcnnnnsn, or LONDON, ENGLAND/ f V orrsnr PRINTING-PRESS Application filed September 15, 1930,. S eria1 No.481,891,";im1in eeinian rro e b r 22, 1929.

The present invention relates to rotary-offset machines for single or multi-color Work.

One of the objects of the present invention is so to arrange the various "operative v cylinders of an offset printing-press so that thepile of printed sheets may accumulate to a considerable height under the plate-cyl' inder of the machine, where the printed sheets are readily inspected by the operator of the machine without the necessity of his ch'angtending the press.

Another object of the invention is so to V arrange the delivery chain or belt that it like.

- wise does not interfere with a clear visibility of the printed sheets delivered from the ma-,

livery being in a space whose one side is de fined by a vertical line that is tangent to the plate-cylinder, while the offset-cylinder is on the farther or trans side of the said plane; that is to say, there is nothing beneath the plate-cylinder except the pile-delivery and the belt or sprocket conveyor bringmg the printed sheets to the said delivery. By.

this arrangement, it becomes possible, without unduly increasing the overall height of the printing-press to have an extremely high pile-delivery, so that the press may be operated fora much longer period without the necessity. of shuttin it down to remove the pile of printed sheets. At the same time,the operator of the press, without changing his position, is able to inspect both the printed sheets and the operation of the inking and moistening rollers, as well as the operation of the machine. It should be particularly ing his normal operative position while at noted that in the arrangement as'hereinbelow described there areno working parts beneath the plate cylinder except the belt or chain sheet-delivery leading to the pile-delivery containing the printed sheets. u

The invention is illustrated bythe accompanying drawings in which Fig. l is a 'dia grammatic side elevation of a single-color offset press; 1 Y 7 Fig. 2 is a similar view of a two-color off set press; and Y Fig. 3 is an'el'evational end-view of the press, showing the'p'ile delivery in which the printed sheets accumulate. Some of the difficulties encountered with the'hithertoknown ofi'set presses are that in the case of single-color machines, each cylinder of which carries one working surface only, and which the pile delivery is fitted underneath "the offset or blanket cylinder, there is only very little room for the pile de' livery, as the distance between the offset cyl inder and the fioor' is'limited, so that it-i's onlypossible to have a pile delivery about 50 centimeters high. A further disadvantage of thehitherto known presses is that the printed. sheet is delivered solowdown that. the operator is unable, withoutchang' ing his position, to view the said printed sheet; In thecase of multi-coloroffsetma chines a higher pile,- say, about to centimeters high, 'is possible, provided I the V pile isarranged-behind the positiontaken' up by the operator, i. e. facing the plate cylinder. With such: air-arrangement the press must needs be of excessive length. The present invention as related to. rotary offset presses, particularly. hi h; speed machines, not only eliminates the isadvantages above mentioned, but also allows of the d length of the machine being shortened, while the height and the width of the machine remain substantiallyas heretofore. By the present invention there is provided a m chine of reasonable overall height which per- 5 mits of an inbuilt pile where the printed sheets may accumulate. The height of the pile is one which obviates the frequent stoppages required for unloading the usual small pile and this increases the output of the ma'-' 1 chine. For example the height of the pile in a machine constructed in accordance with the present invention, may be from 100 to 120 centimeters high. Moreover the said high pile delivery is in front of the operator when looking towards the plate cylinder, and he s thereon are dampened by the dampeningrollers 7.

Referring to Fig. 1, in which'the various rollers of the press are diacylinders and grammatically shown, the sheets to be printed are fed into the press from the feed-board 1, where they are taken up by the impression-cylinder 4: which presses them against the offset or blanket-cylinder 3 upon which a negative of the desired impression has been placed by the inked plates on the plate-cylinder 2. The latter is provided with ink from the fountain 6, and. is kept damp by the dampening rollers 7. The printed sheets are finally delivered to the pile of finished v sheets 8.

In Fig. 2, there is shown anentlrely analogous arrangement in which two-color work can be done.

p In this case the second color'is provided by the plate-cylinder 10, blanket-cylinder 9 and the therewith associated fountain 6 and dampening rollers 7, these two latter appurtenances being identical in construction and fuction' with the similarly numbered parts in Fig. 1, and hence given the same numerical designation.

1 Fig. 3 is an'end viewshowing the ink-' fountain 6, the plate-cylinder, 2, which is there shown being driven by the gearing 12. Thebelt 5 that delivers the printed sheets to the pile 8 is seen in all three figures.

Inaccordance with :the present invention the entire space underneath the plate-cylinder 2 is left clearof all other constructional pa'rts, and houses a pile of printed sheets 100' to 120 centimeters high. This is more particularly attained by placing the rotating axis of the offset or blanket cylinder 3 (lying on the right hand side of the plate cylinder.

2 'in the drawings) above the plane containing. the rotating axes of the plate cylinder 2 andtheimpression-cylinder 4 (arranged on the right hand side of the offset or blanket I cylinder 3 in the drawings, and that the said cylinder 4 is at the same time so arranged or located that the lower part of its periphery lies below the uppermost sheet in the pile 8,

which pile is located beneath the plate cylinder 2.

The chain or belt delivery drum 11 is arranged beneath the impression-cylinder 4 V and lies so low down that the chain 5 consists of an inclined rising part b as well as the usual horizontal. part a. This horizontal part a, of the delivery chain 5 is so arranged that it does not extend towards the right beyond the vertical plane I-II, which .latter'iforms .a tangent to the plate-cylinder 2 on the same side of plate-cylinder as the ofl'set cylinder 3.

V By this arrangement, sufficient space is ained underneath the foremost or plate-cylinder 2 to allow an inbuilt pile to be accom- I modated in that space, the pile being placed so conveniently that the uppermost, sheet is only about 30 centimeters below the periphery of 'the plate-cylinder 2, so that the operator can easily examine a delivered sheet 2' while tendingthe plate cylinder and allied parts. j It willbe notedthat all three cylinders are of the'sam'e diameter, and move with the same peripheral speed. The present inven- :1; tion lies in the way in which the cylinders are arranged, namely in that the rotational axis of the offset cylinder 3 lies above a plane that is defined by a line passing through the center of the'rotational axes of the cylinders 2 and 4. This relationship'is brought out in Figs. 1 and 2 by the broken ,line assing through the central axis of the saic latter cylinders. It will be noticed that the axis of cylinder 3 is considerable above this plane. The belt or chain that transports the sheets from the impressi( n-cylinder 4 to the pile 8 passes over the cylinder. 11, thence traveling to the left in a slanting upward direction (indicated by the portion 6), and deposits the sheets when it has reached the horizontal portion a. By this arrangement it is possible to have a high enough pile-delivery so that the operator of the press can'examine a delivered printed sheet without stooping down i as was necessary with the older types of'o ff- I set press construction;

For the sake of clarity, only suflicient parts of the press to enable an understanding of the present invention are shown on the drawings, hence mechanical means for supporting the belt or chain 5 are notshown except in so far as the location of the vertical plane III requires. This plane is tangential to the periphery of the plate-cylinder 2.

What is claimed as new is:

1. In an offset printing-press the combination of a printing-cylinder, offset-cylinder, impression-cylinder,

sheet-delivery, 0 pile-delivery, and a frame for supporting the said cylinders, the said cylinders and pile- V delivery being so disposed that the rotating.- axis of the offset-cylinder lies onthat side of a plane cQ fl lillg hel'otating axes of the plate-cylinder and impression-cylinder that is remote from the pile-delivery, whereby the pile-delivery thus is situated immediately below said plate-cylinder, one side of the space in which said pile-deliveryis located being defined by a vertical plane that is tangent to the plate-cylinder at the side where it contacts with the offset-cylinder, so that the space housing the pile-delivery is n free from all working parts except the sheet delivery.

2. In an o set printing-press the improvement which comprises the combination of a frame, a printing-cylinder, ofiset-cylinder and impression-cylinder, a delivery mechanism for printed sheets, and a pile-delivery so arranged that thepile-delivery lies on one side of a plane which passes through the rotating axes of the plate-cylinder and impression-cylinder while the rotating axis of the offsetcylinder lies on the opposite side of said plane, whereby the pile-delivery is located in a space which is defined by a vertical plane passin tangent to the plate-cylinder on the side where it contacts with the impression-cylinder, the periphery of the impression-cylinder lying on the plane which is below the topmost plane 01" the space housing the pile delivery, there being no intermediate working parts between the pile-delivery and the plate-cylinder.

3. In an offset printing-press the combination of a frame, a plate-cylinder, oilset-cylinder, impression-cylinder, pile-delivery, and an endless sheet-delivery chain, the said cylinders all being of the same diameter and retational speed and being so disposed that the pile-delivery lies within a space one side of which is defined by a vertical plane that is tangent to the plate-cylinder while the rotational axes of the plate-cylinder and impression-cylinder lie in an oblique plane on one side of which lies the pile-delivery and on the other side of which is the rotational axis of the oilset-cylinder, the impression-cylinder being so disposed that its periphery lies below a horizontal plane defining the upper limit of the pile-delivery space, the sheet-delivery chain being so disposed that a portion of it travels in an oblique upward dir ction and the latter portion of it lying immediately above the pile-delivery travels in a horizontal position, whereby the pile-delivery may be of unusual height without increasing the overall height of the press.

4. In an offset printing-press the combination of a printing-cylinder, an offset-cylinder, an impression-cylinder, a pile-delivery, and a sheet-delivery conveyor, the improvement which consists in placing the pile-delivery in a space lying immediately below that portion of the press which contains the plate-cylinder, said space however not extending beyond a vertical plane tangent to that ide of the plate-cylinder that contacts with the offsetcylinder, the ollset-cylinder having its rotational axis on a different plane from that which passes through the center of the rotational axes of the plate-cylinder and impression-cylinder respectively, the pile-delivery being on one side of said last mentioned plane and the rotational axis of on the other side.

5. In an ofiset printing-press the combination or" the usual plate-cylinder, ofi'set-cylinder, impression-cylinder, pile-delivery, and sheet-delivery conveyor, so disposed as to bring the disposition of the rotating-axis of the offset-cylinder on that side of a plane containing the rotating-axes of the plate and imaression-cylinders remote from the pile-delivery, the impression-cylinder being so placed that the lowest point in its periphery is below the plane of the topmost sheet of the pile-delivery, the sheet-delivery conveyor consisting of a chain containing an upwardly inclined portion and a horizontal portion, the said latter portion lying immediately above the stack of the delivered printed sheets and said horizontal portion being limited by a vertical plane tangent to the periphery of the plate-cylinder at the side where the same contacts with the offset-cylinder.

6. In an offset printing-press the combination of a plate-cylinder, offset-cylinder and impression-cylinder on the one hand and a pile-delivery and sheet-delivery on the other hand, so arranged as to provide a pile-delivery space capable of housing a stack of printed sheets 100 to 120 centimeters high, this being effected by disposing the rotational-axis of the offset-cylinder above a plane defined by a line passing through the rotational-axis of the plate-cylinder and impression-cylinder respectively, said cylinders as well as the offset-cylinder all being of the same diameter and traveling at the same peripheral speed, and by so positioning theimpression-cylinder that the lowest point of its periphery lies fined by the topmost of the delivered printed sheets, the foregoing being in combination with. an endless sheet-delivery chain comprising in its travel a diagonally upwardly inclined portion and a horizontal portion, said latter portion lying immediately above the stack of printed sheets and being limited by a vertical plane tangent to the periphery of the plate-cylinder at the side where the same contacts with the onset-cylinder, there thus being no working parts between the pile of delivered sheets and the plate-cylinder except the horizontal portion of said sheetdelivery chain.

In witness whereof, I scribed my name.

have hereunto sub- HEINRICH HENSE.

the ollset-cylinder below the plane which is de- 

